removed all source lists from the system and made them vectors. Also appended _CMAKE_PATH to the end of the automatic cache entries for executables and libraries. Odds of all these changes working are slim but cmake builds and passes all its tests. VTK40 starts building

ENH: major change, the cmMakefile now contains a master list of cmSourceFile objects, the source lists reference the list via pointers, also you can now set properties on a file, like compile flags, abstract, etc.

ENH: big change, only allow commands access to the cache via the cmMakefile class and GetDefinition, also the cmMakefile is the only way for commands to add to the cache. Also, some changes to configure.in that check for for scoping